Attachment for spectacles.



No. 814,707. PATENTED MAR. 13, 1906.

. J. P. JACKSON.

ATTACHMENT FOR SPEGTAGLES.

APPLICATION FILED MAR. 30.1905.

2 SHEETS-SHEET 1.

h Witnesses JZGIZLYOIZ InvenTor Httomegs No. 814,707. A PATENTED MAR. 13, 1906.

A J. P. JACKSON.

ATTACHMENT FOR SPEGTAGLES.

APPLICATION FILED MAR. 30.1905.

2 SHBETS-SHBET 2.

Inventor y I I I Attorneys T allwhoml it may concern.-

"of Indiana,

provide a device 0 UNITED STATES PATENT OFFICE.

Specification of Letters Patent.

Patented March 13, 1906.

Application filed March 30, 1905- Serial No. 5 1899.

Be it known that I, Join: PLUMMER .JAOK- SON, a citizen of the United States, residing at Orleans, in the county of Orange and State have invented a new and useful Attachment for Spectacles, of which the following is a specification. v

This invention relates to devices of that class known as grab-fronts for attachment to ordinary spectacles or eyeglasses.

' The principal object of the invention is to provide an auxiliary lens-mounting of simple construction which may be readily attached to or removed from the main lens-supporting frame and which will retain its position by gravity, a further objectbein to so distribute the weight of the grabront that the lower ortion only of the same will engage with tfie'lower portions of the main lens-carrying rims, so that there will be no danger of scratchin either lensf Astill rther ob'ect of the invention is to this character in which the auxiliary lens-sup orting rims are arranged at an oblique ang e to the general lane of the auxiliary frame, and the auxiliary ame 1 is provided with widened, hook members,

which will permit the upper portion of the frame'to ride out by gravity until the auxiliary lenses assume an oblique angle to the main lenses. I

With these and other objects in view, as will more fully hereinaftera ear, the invention consists in certain novel eatures of construction and arrangement of arts, hereinafter fully described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that various changes in the form, proportions, size, and minor details of the structure may be made without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawings, Figure 1 is a transverse sectional elevation oi a portion of an ordinary pair of spectacles, illustrating the application thereto of a grab-front con structed in accordance with the invention. Fig. 2 is a front elevation illustrating the grab-front in position on the main frame. Fig. 3 is a detail perspective View of the grabfront detached. Figs. 4 and 5 are detail per-' spective views of portions of the grab-front, the views being on an exaggerated scale. Fig. 6 is a view similar to Fig. 1, illustrating a modified form of grab-front frame. Fig. 7 is a detail perspective view of the same.

Similar characters of reference are employed to indicate corresponding parts throughout the several figures of the drawings.

In the majority of auxiliary lens-carrying frames, or grab-fronts, as they are known to the'trade, no provision is made for preventing contact between the main and auxiliary lenses or between the frame of the grabfront and the main lens, and this soon results in the scratching'of'the lenses and necessitates frequent renewal of the same. In carrying out the present invention provision is made for preventing any contact whatever between the lenses or between any one lens and a portion of the frame of the other, so that there can be no scratching of either set of lenses.

In the drawings, a designates the lens-su porting rims of the main frame, and b t e nose-piece'thereof. The grab-front forming the subject of the present invention includes a bridge or nose piece, to the opposite ends of which are secured arms 2. The lower ends of the arms are curved to follow the general contour of the lower and inner portions of the main rims a and terminate at a oint adjacent to the median vertical lineof said rims. The upper ends of the arms are upset to'form enlargements or lugs 3 for the reception of the securing screw or pin 4 by which the end of the bridge-piece is held to the arm, and each arm is thence bent inwardly and downwardly, forming a hook member of rather extensive width for engagement with the bridge of the main frame. At the end of each of the arms is secured an auxiliary lens-supporting rim 5, containing an auxiliary lens 6. The ends of each rim are provided with ears or lugs 6 of a diameter greater than the Width of the rim or the diameter of the arm, and said ears or lugs are provided with threaded perforations for the passage of a clamping- IOO screw 7, by which the rim may be clamped tightly upon the auxiliary lens.

The main spectacles are to be worn in the usual manner and generally are intended for distant vision. or to examine objects close at hand, the grabfront is dropped onto the main frame, it being merely necessary to place the hooks of the grab-front over the end portions of the bridge, the grab-front assuming its position I10 If the wearer wishes to read 10 5 ETC lenses from contact with the main lenses.

By bending the auxiliary lenscarrying rims outward at an obtuse angle to the general plane of the arms the center of gravity of the auxiliary rims and lenses is moved outward; from the plane of the main lenses in such manner that the ears or lugs 6 will be held by gravity against the main rims, and said ears or lugs will thus form a fulcrum for the movement of the upper portion of the auxiliary frame, so that the latter, being li hter than the auxiliary rims and lenses, wil be drawn forward until the rearmost portions of the bills of the hooks engage with the extreme forward portions of the bridge of the spectacles, and this relation will continue so long as the grabsfront is in use. The width of the hook is, furthermore, of advanta e in that it necessitates no close fitting, and the hook may be readily placed over the bridge without removing the main frame, and there is, furthermore, no necessity of tight clamping -,of the grab-front to the main frame, as is the @2186 with the majority of grab-fronts now commercial use.

In Figs. '6 and .7 is shown a grab-front frame of simple construction also embodying I the invention.

In this case the frame member 2" is made of a single piece having its central port-ion bent to extend over the nose and rovided at its opposite ends with supports or the auxiliary lenses. From the frame member extend the hooks which engage with The nose- 1' the frame of the main spectacles. piece portion of this frame is bent outward approximately in a horizontal plane, and

thus forms a counterweight that will tend to hold the lower portion of the frame in engagement with the rims of the main lenses.

Having thus described the invention, what is claimed is 1. In a grab-front for s ectacles or eyeglasses, a frame having wi e hooks for leose en agement with the main lens-moufa ng, an including arms which follow generally the curvature of the inner and lower portions of the main .lensesu pportingg rims, auxiliary lenssupporting rims :carried by said arms and bent outward in a plane oblique to the general plane of said arms, said auxiliary rims having enlarged ears or lugs which are forced by gravity against the lower portions .of the main irims to form fu-lcrums for effecting outward movement of the upper portion of the frame with respect to the main lensmounti-ng.

2.. In a grab-front for spectacles or eyeglasses, a frame including a pair of curved arms and a nose-.pi-ece, .a air of weighted hooks for engagement with the main Ilensmounting, auxiliary lens-carrying rims having their lower edges secured to the end portions of the arms, the auxiliary rims being vbentoutward at an angle oblique to the general plane "of the .arms, the upper portion of the nosespieoe being bent out at .an' angle to 1 such plane, thereby throwing the center of gravity forward and causing the lower portions of said rims to rest against the lower portions of the main lens-rims.

In testimony that I claim the foregoing as my own I have hereto affixed my .signature in the presence of two witnesses.

JOHN PLUMMER JACKSON. Witnesses:

JOHN D. CARTER, CHARLES P. COLLINS. 

